Stencil sheet



.40 also prefer to employ a suitable plasticizing treated cellulose.

' 50 and of such mixture and such oils sufiicient 4. A stencil sheetcoating including nitro- Patented Nov. so, 1926. 15508,74Z

UNITED STATES PATENT- err-ice.-

EDWABD'W. HILL, OF CHICAGO, ILLINOIS, ASSIGNOB TO A. B. DICK COKPANY, OF

CHICAGO, ILLINOIS, A CORPORATION 01 ILLINOIS.

STENCIL SHEET. No Drawing. Application filed December 8, 1923. SerialNo. 678,183. I

1 This invention relates nerally to sothe manner Commonly practised. i.e., by called dry-process stenci -sheets and pardrawing the yoshino overthe surface of the 6 ticularly to sheets of the type employing ascoating compound, which thereupon is taken a coating constituenta'material such as nitroup and absorbed by the fibres, after which 5cellulose or other cellulose esters. The inthe coated sheet may be hungto set as a revention, which centers about the coating, as sult of theevaporation of the volatiles'oldistinguished from the supporting basevents. As such evaporation. proceeds, the yoshino or other porous fabriccommonly cellulose sets and occludes or encases, in a employed in theart, has for its object to profinely divided state, much of thepetroleum l0 duce a material which shall, upon applicaoil along withsome quantity of the vegetation to a supporting base, set quickly andble oils and other constituents which areincompletely impermeatize thesheet without. soluble in and are nonlvents of the cellu-, repetition ofthe application; which shall lose esters. The resulting' coating on thebe stable throughout an extended period of paper is not, therefore, tobe-regarded as a time and capable of receiving type-impresomogeneousmass but as one consisting of sions without preliminary moistening or asolid or semi-solid mass which'occludes or other treatmentywhich shallhave a wide encases,-.in a finely divided state, a part of 9 softeningrange and be therefore substanthe oils or oily masses, either liquidorsemitially unaffected by tem erature changes, solid. p I and which shallrespon uniformly and In making up my coating compound. 'I clearly to thepressure of the type or stylus may, if desired, employ a suitable pi entn the production f'the desired stencil charor soluble dye-stuff, such,"for examp e, as 75 acters. v carbon black, methyleiie blue and the like,In carrying out the invention in an a serving not only to color thecompound but,

roved form, I first dissolve nitro cellulose in the case of thepigment,to lend body to ma suitable volatile solvent such as etherthecompound. Also, as a'bod'ying and alcohol, amyl or ethyl acetate,acetone or -a toughening agent I may employs, suitable mixturecontaining two or more of these gum, as resin, which is soluble inthemutual I solvents. I then add a heavy, non-volatile solvents butinsoluble in petroleum oil. This 7 oil (preferably one havinglubricating propgum resin may be either'synthetic or natuerties), suchas petroleum oil either with or ral. Coumarone resinof the syntheticgroup without previous admixture of another solor m sandarac of thenatural group of event (such as a halogenated aliphatic hydrop ucts willbe found satisfactory. Fi-

carbon, an aliphatic or aromatic ester or the nally, it is important tonote that the inven-' like), which will mix with both'the solvents tionis not limited to nitrocellulose orcelluof the nitro-cellulo'se and thepetroleum oil. lose acetate and, in fact, other cellulose es- I also adda tem ring agent such as castor ters may be employeddnstead.consequentoil and, if foun desirable, a fatty matter 1y, to avoidlimitation, I shall refer tothis such as oleic or stearic acid or thelike. I c ns i ent herein by he t rm chemically.

agent such as chlorinated naphthalene, acet- What I claim is analid, orthe like. 1. A stencil sheet coating vwhich includes The order ofaddition of the ingredients a cellulose compound luding orencasing tothe solution may be atly varied accord-- a lubricant. ing to thecharacter 0 the solvent used, the 2. A stencil sheet coatin whichincludes proportions desired and the temperature'at a cellulose compoundocclu g or encasing which the mass is mixed. The mixture of a lubricantin afinely divided state. solvents holds the nitro-cellulose,' oils and3. A stencil sheet coating including nitroplasticizing agent all insolution in the mass cellulose occluding or encasing a lubricant.

should be'used to bring the. compound to the cellulose occluding orencasing a hydrocarproperconsistency forcoating the sheets of bon oil.yoshino. .Such coating may be effected in 5. In a type-impressiblestencil-sheet, an

open, porous base having a coating including a cellulose compound and ahydrocarbon o1.

6. In a ty ge-impressible stencil-sheet, an open, porous a cellulosecompound carbon oil.

7. In a type-impressible stencil-sheet, an open, porous base having acoating including a cellulose compound and a non-volatile and a heavy,hydrohydrocarbon oil.

8. In a type-impressible stencil-sheet, an open, porous ba's e having acoating including'a cellulose o ompound and a heavy, nonvolatilehydrocarbon oil.

9. In a type-impressible stencil-sheet, an open, porous base having acoating including a cellulose compound, a tempering agent and anon-volatile oil.

10. In a type-impressible stencil sheet, an open, orous base having acoating includin a cellulose compound, a tempering agent and a heavy,non-volatile oil.

n a type-impressible stencil-sheet, an

open, porous base having a coating including a cellulose compound, atempering agent and a non-volatile hydrocarbon oil.

12. Ina type-impressible stencil sheet, an

open, 'porous base having a coating including acellulose compound, atempering agent and a plasticizing agent.

13. In atype-impressible stencil sheet an 1 open, porous base having acoating inclu ing a cellulose compound, a tempering agent, aplasticizing agent, and a non-volatile oil.

14. In a type-impressible stencil-sheet, an open, porous base having acoating including a cellulose compound, a tempering agent, aplasticizing agent, and hydrocarbon oil.

15. In a type-impressible stencil-sheet, an open, porous basehaving acoating including a cellulose compound, a tempering agent, aplasticizingagent, andheavy, hydrocarbon o1 16. In a .type-impressiblestencil-sheet, an open, porous base having a coating including acellulose compound, a tempering agent, a plasticizing agent and a heavy,non-volatile hydrocarbon oil.

17. In a type-impressible stencil-sheet, an

ase havinga coatingincludingoccluded eluded or encased in plasticizingagent.

open, porous base having a coating including a cellulose compound,castor oil, a plasticizing agent and hydrocarbon oil.

In a type-impressible stencil-sheet, an open, orous base having acoating including a cellulose compound, castor oil, a plasticizing agentand heav hydrocarbon oil,

19. In a type-impressible stencil-sheet, an open, porous base having acoating including a cellulose compound, a tempering agent, anon-volatile oil and fatty matter.

20. In a type-impresslble stencil-sheet, an open, porous base having acoating including a cellulose compound, a tempering agent, anon-volatile oil, a plasticizing agent and fatty matter. v v

21. In a type-impressible stencil sheet, an open, porous base having acoating including a cellulose ester, a tempering agent, and

chlorinated naphthalene.

pressible stencil-sheet whichconsists in coatin" an 0 en orous base withchemicall 23. The process of producing a type-ime process of producing atypeimpressible stencil-sheet which consists in coat- 111g an open,porous base with chemically treated cellulose in solution and anotherproperties I material possessing lubricating g or encased in suchcellulose in -a finelydivicled state.

24. The process of producing a type-impressible stencil-sheet whichconsists in coating an open,

rial possessing lubricating properties oc such cellulose, and a 25. Theprocess of producing. a type-impressible ste'n'cil-sheetwhich consistsin coating an open, porous base with chemically treated cellulose insolution,'another material possessing lubricating properties occluded orencasedin such cellulose in a finely divided state, and a plasticizingagent.

This specification s gned and witnessed this 28th day of November,,1923.

EDWARD W. HILL.

porous base with chemically. treated cellulose in solution, another mate

